<!DOCTYPE html>
<script>
if (window.internals)
  internals.useMockOverlayScrollbars();
</script>
<div style="width: 200px; height: 200px; overflow: scroll">
  <div style="background: green; width: 200px; height: 70px"></div>
  <!-- This div let the top-level div have the same layout overflow as in the test. -->
  <div style="width: 210px; height: 220px"></div>
</div>
